﻿// DefaultHandler2.java - extended DefaultHandler
// http://www.saxproject.org
// Public Domain: no warranty.
// $Id$
using System;
using org.xml.sax.helpers;

namespace org.xml.sax.ext
{


    /**
     * This class extends the SAX2 base handler class to support the
     * SAX2 {@link LexicalHandler}, {@link DeclHandler}, and
     * {@link EntityResolver2} extensions.  Except for overriding the
     * original SAX1 {@link DefaultHandler#resolveEntity resolveEntity()}
     * method the added handler methods just return.  Subclassers may
     * override everything on a method-by-method basis.
     *
     * <blockquote>
     * <em>This module, both source code and documentation, is in the
     * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
     * </blockquote>
     *
     * <p> <em>Note:</em> this class might yet learn that the
     * <em>ContentHandler.setDocumentLocator()</em> call might be passed a
     * {@link Locator2} object, and that the
     * <em>ContentHandler.startElement()</em> call might be passed a
     * {@link Attributes2} object.
     *
     * @since SAX 2.0 (extensions 1.1 alpha)
     * @author David Brownell
     * @version TBS
     */
    public class DefaultHandler2 : DefaultHandler
        , LexicalHandler, DeclHandler, EntityResolver2
    {
        /** Constructs a handler which ignores all parsing events. */
        public DefaultHandler2() { }


        // SAX2 ext-1.0 LexicalHandler

        public void startCDATA()
        //throws  SAXException
        { }

        public void endCDATA()
        //throws  SAXException
        { }

        public void startDTD(String name, String publicId, String systemId)
        //throws  SAXException
        { }

        public void endDTD()
        //throws  SAXException
        { }

        public void startEntity(String name)
        //throws  SAXException
        { }

        public void endEntity(String name)
        //throws  SAXException
        { }

        public void comment(char[] ch, int start, int length)
        //throws  SAXException
        { }


        // SAX2 ext-1.0 DeclHandler

        public void attributeDecl(String eName, String aName,
            String type, String mode, String value)
        //throws  SAXException
        { }

        public void elementDecl(String name, String model)
        //throws  SAXException
        { }

        public void externalEntityDecl(String name,
            String publicId, String systemId)
        //throws  SAXException
        { }

        public void internalEntityDecl(String name, String value)
        //throws  SAXException
        { }

        // SAX2 ext-1.1 EntityResolver2

        /**
         * Tells the parser that if no external subset has been declared
         * in the document text, none should be used.
         */
        public InputSource getExternalSubset(String name, String baseURI)
        //throws  SAXException, IOException
        { return null; }

        /**
         * Tells the parser to resolve the systemId against the baseURI
         * and read the entity text from that resulting absolute URI.
         * Note that because the older
         * {@link DefaultHandler#resolveEntity DefaultHandler.resolveEntity()},
         * method is overridden to call this one, this method may sometimes 
         * be invoked with null <em>name</em> and <em>baseURI</em>, and
         * with the <em>systemId</em> already absolutized.
         */
        public InputSource resolveEntity(String name, String publicId,
            String baseURI, String systemId)
        //throws  SAXException, IOException
        { return null; }

        // SAX1 EntityResolver

        /**
         * Invokes
         * {@link EntityResolver2#resolveEntity EntityResolver2.resolveEntity()}
         * with null entity name and base URI.
         * You only need to override that method to use this class.
         */
        public InputSource resolveEntity(String publicId, String systemId)
        //throws  SAXException, IOException
        { return resolveEntity(null, publicId, null, systemId); }
    }
}